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The Air Accidents Investigation Branch investigated what happened and has now released a report to explain what happened.

The pilot was flying a Liberty XL-2 (Image: David/Aeroprints)

The report explained: "As the pilot levelled off after climbing to his cruise altitude, he became aware of a vibration which was getting louder.

"The left door then opened suddenly and his headset and glasses were torn off by the slipstream. He donned his spare glasses quickly and tried to reach his spare headset and handheld transceiver, but was unable to.

"He realised that flying the aircraft was the greatest priority and concentrated on this. He selected 7700 on the transponder and returned to land back at Biggin Hill.

'Unable to say he checked the door before take-off'

"The pilot was behind schedule but did not feel rushed. He was unable to say categorically that he had checked the security of the left door prior to takeoff and considered that it had not been fully latched.

"This occurrence highlights the importance of ensuring that spare glasses are within reach and concentrating on flying the aircraft following an unexpected event."

The pilot involved in the incident was a 66 year old male with a private pilot's licence. At the time of the report he had clocked 625 hours of flying time.

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